1. https://www.youtube.com/watch?v=a_mFlafGyy8
2. https://www.youtube.com/watch?v=3CkMDLsoEjk
3. https://www.youtube.com/watch?v=_B8BRYoJJ6M
1. https://naurok.com.ua/test/defining-and-non-defining-relative-clauses-842916.html
1. https://grade.ua/uk/blog/vse-o-relative-clauses-v-angliyskom-smotrim-na-pravila-i-primery/